Muscles of the Upper Extremity. 



187 



Tendo 



M. flex 

 rad 





249. The Muscles of the Hand. 250. The Muscles of the Hand. 



The Muscles of the Little Finger, Hypothenar : 



M. palmaris brevis (Fig. 247) arises from the palmar aponeurosis, 

 and is inserted into the skin on the ulnar border of the palm of the hand. 



M. abductor digiti minimi (Fig. 248) arises from the pisiform bone 

 and is inserted into the base of the first phalanx and dorsal aponeurosis 

 of the little finger. 



M. flexor brevis dig. min, (Fig. 248) arises from the annular liga- 

 ment (Lig. carpi transversum) and the process of the unciform bone; its 

 insertion is like the preceding. 



M. opponens dig. min. s. flexor ossis metacarpi dig. min. arises from the 

 unciform process and annular ligament and is inserted into the shaft and 

 head of the metacarpal bone of the little finger. 



The Musculi interossei: 



Three palmar or internal interossei muscles. Orig.: Of the first from the 

 ulnar surface of the metacarpal bone of the index finger ; of the second from 

 the radial surface of the metacarpal bone of the fourth finger; of the third 

 from the radial surface of the metacarpal bone of the fifth finger. Insert. : 

 Dorsal aponeurosis of the first phalanges. (Adductors.) 



Four dorsal or external interossei muscles. Orig. : By two heads from 

 the contiguous surfaces of the four metacarpal bones. Insert. : Dorsal apo- 

 neurosis of the second, third, and fourth fingers. (Abductors.) 



24* 



